but if they do, i guarantee you it is not jimmy hoffa. >> reporter: anthony says the fbi has a good idea who pulled off the hit and where, but it sure wasn't in this neighborhood. why could the fbi never find the body? >> because there is no body. the body, in our opinion, was cremated or was thrown into a vat of acid or whatever. >> reporter: whatever happened, the mafia backed teamster boss is legendary. celebrated in movies like this one, going up against u.s. attorney general robert kennedy. >> the justice department has plenty on you mr. hoffa. >> you don't impress me. i don't need $300 million and my brother elected -- >> reporter: many failed attempts to find him, tips had him buried in cement near the end zone of old giant stadium. they looked for blood stains on the floor boards of an old detroit home. hoffa's middle name was riddle and so is trying to pinpoint why his fate captivates so many people. >> he was a negotiator and powerful and combined that with his mysterious disappearance and the connection with the underworld and the mob. >> reporter: so, now, the question is, wi